package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * @author ACE-Felix
 */
@Service
public class UserServiceImpl implements UserService {
    // 微信服务接口地址
    private static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenId(userLoginDTO.getCode());
        // 判断open id为空，如果为空则登录失败，抛出业务异常
         if (openid == null) {
             throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
         }
        // 判断当前用户是否为新用户，如果是新用户，自动完成注册
        User user = userMapper.getByOpenid(openid);
         if (user == null) {
             user = User.builder()
                        .openid(openid)
                        .createTime(LocalDateTime.now())
                        .build();
             userMapper.insert(user);
         }
        // 返回用户对象
        return user;
    }

    /**
     * 获取当前微信用户open id
     * @param code
     * @return
     */
    private String getOpenId(String  code) {
        // 调用微信接口服务，获取当前微信用户的open id
        Map<String, String> queryParams = new HashMap<>();
        queryParams.put("appid", weChatProperties.getAppid());
        queryParams.put("secret", weChatProperties.getSecret());
        queryParams.put("js_code", code);
        queryParams.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN_URL, queryParams);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
